Marriages in the Fronde

While I was reading up on the century of French civil wars (1559-1653), I discovered there were several marriage alliances proposed during the Fronde, but two of the more interesting ones were:

Mlle de Guise was engaged to the duc de Mercoeur (Louis de Bourbon-Vendome (1612-1669)) and later to Wladyslaw IV of Poland.

Mlle de Chevreuse (daughter of another prince of Lorraine) was betrothed at one point to the duc de Beaufort (brother of Mercoeur), then to the duke of Brunswick-Zeil, before being allied to the prince de Conti in 1650. The marriage was prevented by his vacillation and her early death.

Both women were put forward to solidify alliances between two parties of Frondeurs.

What if these marriages were to come to pass? Mlle de Guise was Gaston d'Orléans' one-time (half-)sister-in-law, while Mlle de Chevreuse was the daughter of the famous intrigante and member of the house of Rohan, the duchesse de Chevreuse.
 
Since @American Warrior has asked of late about the comte de Soissons surviving, I've decided to revisit this thread.

Marie de Guise became the heiress to the Guise lands when her great-nephew died young. She was also heiress to some of the lands of La Grande Mademoiselle. Were she to marry Wladyslaw IV and give him an heir, how would it look if the Polish king is also inherits some lands in France? And the Welf prince was George I's uncle, so if she were to give him an heir, there's a good chance George would never be more important than a cadet princr of a cadet line.

Of the Chevreuse girls, none ever married, but it doesn't seem impossible that any would marry. Would deprive Mazarin of bridegrooms for two of his nieces if Marie de Guise or one of the Chevreuse girls were to end up as duc de Mercoeur as well as princesse de Conti
 
If Marie Louise Gonzaga was married before 1645 (she was 34 yo already, so that was far from impossible) then other French spouse for Władysław IV is likely (Marie Louise was choosen by Władysław due to her Palailogos blood). If Guise candidate replaces her and has a son with W4, then unlike IOTL it is rather unlikely, that Władysław IV's widow would marry his brother. Even IOTL marriage of John Casimir with brother's widow was very controversial and viewed as incestous by nobility (but was supported by magnates). If Mademoiselle de Guise has child with King, then such incest would be unacceptable. John Casimir would marry different woman. If John Casimir has his own sons, he could try to get rid of nephew by sending him to France to inherit Guise lands. So younger Vasa line, descendants of Jan Kazimierz, would rule PLC, while older line started by Władysław's son would start House Vasa-Guise in France.
 
Another marriage spoken of, I think it was around this time, was of La Grande Mademoiselle to the Comte de Soissons. Any thoughts?

Well, there were plans for her to marry pretty much each and every male of a royal blood (including Louis XIV, which was a complete insanity but still seriously taken). And she ended up marrying a foul-tempered nobody who treated her as dirt and kept extorting her estates and money. x'D

Not sure that any specific marriage of her and 2 earlier candidates would change anything substantial: the Fronde would be defeated anyway, both politically and militarily. Potential advantages gained by a specific "prince" due to a marriage may (or may not) result in him getting slightly more concessions (not sure that anything would improve situation for duc de Beaufort: he was too big of an idiot): unlike the royal side, Fronde did not have a single meaningful leader and when Conde tried to play one, it became quite clear that the shoes are too big for him. De Retz had brains (or at least bragged that he did, his memoirs are an endless litany of self promotions but it does not look like he could raise about the level of the routine court intrigues). Mazarin could and did outmaneuver his opponents politically and Turenne did the same militarily so the different marriages would not make critical difference.
 
Not sure that any specific marriage of her and 2 earlier candidates would change anything substantial: the Fronde would be defeated anyway, both politically and militarily. Potential advantages gained by a specific "prince" due to a marriage may (or may not) result in him getting slightly more concessions (not sure that anything would improve situation for duc de Beaufort: he was too big of an idiot): unlike the royal side, Fronde did not have a single meaningful leader and when Conde tried to play one, it became quite clear that the shoes are too big for him. De Retz had brains (or at least bragged that he did, his memoirs are an endless litany of self promotions but it does not look like he could raise about the level of the routine court intrigues). Mazarin could and did outmaneuver his opponents politically and Turenne did the same militarily so the different marriages would not make critical difference.

Sorry that I wasn't clear. The idea wasn't somehow to make the Fronde successful, simply that these marriages would've PROBABLY taken place DURING the Fronde. The critical differences would presumably ensue AFTER the Fronde (the Bourbon-Vendôme branch gaining the majority of the Guise lands - with the exception of the duchy of Angoulême - and, if all goes as OTL with La Grande Mademoiselle marrying, the Vendôme issue from Madame de Guise would be heirs to a portion of Mademoiselle's estates. Which would make Vendôme (theoretically) a rather well off match (he'd already have the duchies of Mercoeur and Penthièvre (in addition to Vendôme), and from the Guises he'd inherit the dukedom of Joyeuse, the county of Eu, the principality of Joinville and the county of Romorantin (which Louis XIV denied to Monsieur).

Sure, Louis might buy the Vendômes off, but considering Madame de Guise's personality (she threatened to legitimate her bastards as a way of keeping her heirs in line - and she was rather pissed at La Mademoiselle for marrying Caumont - so I think she'd play a form of hardball TTL as well), I'm not sure that he'd be entirely successful. Maybe a division between Monsieur and Vendôme (he'd have to find Maine a rich heiress to marry - perhaps a Vendôme girl)
 
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